Coherent phonons

Generation of coherent acoustic phonons in GaN-based p-n junction

Kung-Hsuan Lin

[email protected]

Department of Electrical Engineering and Graduate Institute of Electro-Optical Engineering, National Taiwan University, Taipei, 10617, Taiwan

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Cheng-Ta Yu,

Cheng-Ta Yu

Department of Electrical Engineering and Graduate Institute of Electro-Optical Engineering, National Taiwan University, Taipei, 10617, Taiwan

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Stacia Keller,

Stacia Keller

Department of Electrical and Computer Engineering, University of California, Santa Barbara, CA 93106, USA

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Umesh Mishra,

Umesh Mishra

Department of Electrical and Computer Engineering, University of California, Santa Barbara, CA 93106, USA

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Steven P. DenBaars,

Steven P. DenBaars

Department of Electrical and Computer Engineering, University of California, Santa Barbara, CA 93106, USA

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Chi-Kuang Sun,

Chi-Kuang Sun

[email protected]

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Kung-Hsuan Lin,

Kung-Hsuan Lin

[email protected]

Department of Electrical Engineering and Graduate Institute of Electro-Optical Engineering, National Taiwan University, Taipei, 10617, Taiwan

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Cheng-Ta Yu,

Cheng-Ta Yu

Department of Electrical Engineering and Graduate Institute of Electro-Optical Engineering, National Taiwan University, Taipei, 10617, Taiwan

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Stacia Keller,

Stacia Keller

Department of Electrical and Computer Engineering, University of California, Santa Barbara, CA 93106, USA

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Umesh Mishra,

Umesh Mishra

Department of Electrical and Computer Engineering, University of California, Santa Barbara, CA 93106, USA

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Steven P. DenBaars,

Steven P. DenBaars

Department of Electrical and Computer Engineering, University of California, Santa Barbara, CA 93106, USA

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Chi-Kuang Sun,

Chi-Kuang Sun

[email protected]

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First published: 16 November 2004

https://doi.org/10.1002/pssc.200405404

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Abstract

Coherent acoustic phonons were generated in the piezoelectric bulk semiconductor through inverse piezoelectric effect by femtosecond laser pulses. While the photocarriers are generated in the depletion region of the piezoelectric semiconductor, the electrons and holes sweep in counter-directions due to the built-in electric field and result in strain pulses through the piezoelectric effect. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

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